html,
body,
div,
button,
p,
img {
  margin: 0;
  padding: 0;
}

.box {
  width: 1200;
  margin: 0 auto;
}

.btn-group,
.tip {
  text-align: center;
}

.btn {
  cursor: pointer;
  padding: 4px 6px;
}

.btn:hover {
  background: #eee;
  color: brown;
}

.loading {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: #eee;
  font-size: 20px;
  color: chocolate;
  display: flex;
  justify-content: center;
  align-items: center;
}
